#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2020 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Unit tests for git helper functions."""

from __future__ import print_function

import os
import subprocess
import unittest
import unittest.mock as mock

import git

# These are unittests; protected access is OK to a point.
# pylint: disable=protected-access


class HelperFunctionsTest(unittest.TestCase):
  """Test class for updating LLVM hashes of packages."""

  @mock.patch.object(os.path, 'isdir', return_value=False)
  def testFailedToCreateBranchForInvalidDirectoryPath(self, mock_isdir):
    path_to_repo = '/invalid/path/to/repo'
    branch = 'branch-name'

    # Verify the exception is raised when provided an invalid directory path.
    with self.assertRaises(ValueError) as err:
      git.CreateBranch(path_to_repo, branch)

    self.assertEqual(
        str(err.exception),
        'Invalid directory path provided: %s' % path_to_repo)

    mock_isdir.assert_called_once()

  @mock.patch.object(os.path, 'isdir', return_value=True)
  @mock.patch.object(subprocess, 'check_output', return_value=None)
  def testSuccessfullyCreatedBranch(self, mock_command_output, mock_isdir):
    path_to_repo = '/path/to/repo'
    branch = 'branch-name'

    git.CreateBranch(path_to_repo, branch)

    mock_isdir.assert_called_once_with(path_to_repo)

    self.assertEqual(mock_command_output.call_count, 2)

  @mock.patch.object(os.path, 'isdir', return_value=False)
  def testFailedToDeleteBranchForInvalidDirectoryPath(self, mock_isdir):
    path_to_repo = '/invalid/path/to/repo'
    branch = 'branch-name'

    # Verify the exception is raised on an invalid repo path.
    with self.assertRaises(ValueError) as err:
      git.DeleteBranch(path_to_repo, branch)

    self.assertEqual(
        str(err.exception),
        'Invalid directory path provided: %s' % path_to_repo)

    mock_isdir.assert_called_once()

  @mock.patch.object(os.path, 'isdir', return_value=True)
  @mock.patch.object(subprocess, 'check_output', return_value=None)
  def testSuccessfullyDeletedBranch(self, mock_command_output, mock_isdir):
    path_to_repo = '/valid/path/to/repo'
    branch = 'branch-name'

    git.DeleteBranch(path_to_repo, branch)

    mock_isdir.assert_called_once_with(path_to_repo)

    self.assertEqual(mock_command_output.call_count, 3)

  @mock.patch.object(os.path, 'isdir', return_value=False)
  def testFailedToUploadChangesForInvalidDirectoryPath(self, mock_isdir):
    path_to_repo = '/some/path/to/repo'
    branch = 'update-LLVM_NEXT_HASH-a123testhash3'
    commit_messages = ['Test message']

    # Verify exception is raised when on an invalid repo path.
    with self.assertRaises(ValueError) as err:
      git.UploadChanges(path_to_repo, branch, commit_messages)

    self.assertEqual(
        str(err.exception), 'Invalid path provided: %s' % path_to_repo)

    mock_isdir.assert_called_once()

  @mock.patch.object(os.path, 'isdir', return_value=True)
  @mock.patch.object(subprocess, 'check_output', return_value=None)
  @mock.patch.object(subprocess, 'Popen')
  def testFailedToUploadChangesForReview(self, mock_repo_upload,
                                         mock_command_output, mock_isdir):

    # Simulate the behavior of 'subprocess.Popen()' when uploading the changes
    # for review
    #
    # `Popen.communicate()` returns a tuple of `stdout` and `stderr`.
    mock_repo_upload.return_value.communicate.return_value = (
        None, 'Branch does not exist.')

    # Exit code of 1 means failed to upload changes for review.
    mock_repo_upload.return_value.returncode = 1

    path_to_repo = '/some/path/to/repo'
    branch = 'invalid-branch-name'
    commit_messages = ['Test message']

    # Verify exception is raised when failed to upload the changes for review.
    with self.assertRaises(ValueError) as err:
      git.UploadChanges(path_to_repo, branch, commit_messages)

    self.assertEqual(str(err.exception), 'Failed to upload changes for review')

    mock_isdir.assert_called_once_with(path_to_repo)

    mock_command_output.assert_called_once()
    mock_command_output_args = mock_command_output.call_args_list[0][0][0]
    expected_mock_command_output_prefix = ['git', 'commit', '-F']
    self.assertEqual(
        mock_command_output_args[:len(expected_mock_command_output_prefix)],
        expected_mock_command_output_prefix)

    mock_repo_upload.assert_called_once()

  @mock.patch.object(os.path, 'isdir', return_value=True)
  @mock.patch.object(subprocess, 'check_output', return_value=None)
  @mock.patch.object(subprocess, 'Popen')
  def testSuccessfullyUploadedChangesForReview(self, mock_repo_upload,
                                               mock_command_output, mock_isdir):

    # A test CL generated by `repo upload`.
    repo_upload_contents = ('remote: https://chromium-review.googlesource.'
                            'com/c/chromiumos/overlays/chromiumos-overlay/'
                            '+/193147 Fix stdout')

    # Simulate the behavior of 'subprocess.Popen()' when uploading the changes
    # for review
    #
    # `Popen.communicate()` returns a tuple of `stdout` and `stderr`.
    mock_repo_upload.return_value.communicate.return_value = (
        repo_upload_contents, None)

    # Exit code of 0 means successfully uploaded changes for review.
    mock_repo_upload.return_value.returncode = 0

    path_to_repo = '/some/path/to/repo'
    branch = 'branch-name'
    commit_messages = ['Test message']

    change_list = git.UploadChanges(path_to_repo, branch, commit_messages)

    self.assertEqual(
        change_list.url,
        'https://chromium-review.googlesource.com/c/chromiumos/overlays/'
        'chromiumos-overlay/+/193147')

    self.assertEqual(change_list.cl_number, 193147)

    mock_isdir.assert_called_once_with(path_to_repo)

    mock_command_output.assert_called_once()

    mock_repo_upload.assert_called_once()


if __name__ == '__main__':
  unittest.main()